8261555841 has 144 divisors (see below), whose sum is σ = 16310915712. Its totient is φ = 3927813120.

The previous prime is 8261555839. The next prime is 8261555843. The reversal of 8261555841 is 1485551628.

8261555841 is a `hidden beast` number, since 8 + 2 + 61 + 5 + 5 + 584 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (8261555839) and next prime (8261555843).

It is not a de Polignac number, because 8261555841 - 2¹ = 8261555839 is a prime.

It is a super-2 number, since 2×8261555841² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8261555843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4794006 + ... + 4795728.

It is an arithmetic number, because the mean of its divisors is an integer number (113270248).

Almost surely, 2^8261555841 is an apocalyptic number.

It is an amenable number.

8261555841 is a deficient number, since it is larger than the sum of its proper divisors (8049359871).

8261555841 is a wasteful number, since it uses less digits than its factorization.

8261555841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812 (or 1798 counting only the distinct ones).

The product of its digits is 384000, while the sum is 45.

The square root of 8261555841 is about 90893.1011738515. The cubic root of 8261555841 is about 2021.5630030334.

The spelling of 8261555841 in words is "eight billion, two hundred sixty-one million, five hundred fifty-five thousand, eight hundred forty-one".